Defensive publication

ABSTRACT

UNDESIRED POLYMERIZATION OF VINYL MONOMERS, EITHER IN STORAGE OR WHILE UNDERGOING PURIFICATION BY DISTILLATION OF THE MONOMERIC MATERIAL (AS A STEP IN THE PROCESS BY WHICH THE MONOMERS ARE SYNTHESIZED), CAN BE PREVENTED BY ADDING THE LIQUOR MONOMER AS A POLYMERIZATION INHIBITOR SMALL AMOUNTS OF AN ALKYL ETHER OF 2,6-DI-TER-BUTYL HYDROQUINONE SUCH AS 2,6-DI-TERT-BUTYL-4-OCTYLOXYPHENOL; 2,6-DITERT-BUTYL-4-METHOXYPHENOL; 2,2&#39;&#39;-BIS(2,5-DI-TERT-BUTYL-4-HYDROXYPHENOXY) -P-XYLENE; 1,4-BIS(3,5-DI-TERT-BUTYL-4-HYDROXYPHENOXY)BUTANE; 2,6-DI-TERT-BUTYL-4-BENZOYLOXPHENOL; AND 1,4-BIS(3,5-DI-TERT-BUTYL-4-HYDROXYPHENOXY-PXYLENE. BY EMPLOYING AN INHIBITOR OF THIS TYPE, UNDESIRED POLYMERIZATION OF THE MONOMER IN STORAGE, PURIFICATION, OR USE IS EFFECTIVELY PREVENTED. THIS CLASS OF INHIBITORS CONTRIBUTE NO UNDESIRABLE COLOR TO VINYL MONOMERS TO WHICH THEY ARE ADDED AND DO NOT INTERFERE IN ANY WAY WITH SUBSEQUENT PROCESSING OF THE STABILIZED MONOMER INTO ANY DESIRED ULTIMATE PRODUCT.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.'16. 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflic makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED JUNE 1, 1971 T887,010 INI-HBITING POLYMERIZATION OF VINYLMONOMERS Arthur P. Werts III, 1362 Lafayette Circle, Kingsport, Tenn.37664 Filed July 2, 1970, Ser. No. 52,080 Int. Cl. B01j I/16; C07c 17/42US. Cl. 252-404 No Drawing. 10 Pages Specification Undesiredpolymerization of vinyl monomers, either in storage or while undergoingpurification by distillation of the monomeric material (as a step in theprocess by which the monomers are synthesized), can be prevented byadding to the liquid monomer as a polymerization inhibitor small amountsof an alkyl ether of 2,6-di-tert-butyl hydroquinone such as2,6-di-tert-butyl-4-octyloxyphenol; 2,6-ditert-buty1-4-methoxyphenol;2,2'-bis(3,5-di-tert-butyl-4-hydroxyphenoxy) p xylene;1,4-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)butane;2,6-di-tert-butyl-4-benzoyloxyphenol; and 1,4-bis(3,5-di-tert-butyl 4hydroxyphenoxy)-pxylene. By employing an inhibitor of this type,undesired polymerization of the monomer in storage, purification, or useis effectively prevented. This class of inhibitors contribute noundesirable color to vinyl monomers to which they are added and do notinterfere in any 'way with subsequent processing of the stabilizedmonomer into any desired ultimate product.

